private void btnPop_Click(object sender, RoutedEventArgs e)
{
if (popWindow == null)
{
popWindow = new PopWindow();
popWindow.Closed -= PopWindow_Closed;
popWindow.Closed += PopWindow_Closed;
popWindow.Owner = Application.Current.MainWindow;
popWindow.ShowDialog();
}
else if (!popWindow.IsActive)
{
popWindow.WindowState = WindowState.Normal;
popWindow.Activate();
}
}
private void PopWindow_Closed(object sender, EventArgs e)
{
popWindow = null;
}